Added README description for CMake

README

@@ -52,6 +52,7 @@ FLAC - 1.3.2 - Contents
 - Building with Makefile.lite
 - Building with MSVC
 - Building on Mac OS X
+- Building with CMake
 
 
 ===============================================================================
@@ -252,3 +253,84 @@ Building on Mac OS X
 
 If you have Fink or a recent version of OS X with the proper autotools,
 the GNU flow above should work.
+
+
+===============================================================================
+Building with CMake
+===============================================================================
+
+CMake is a cross-platform build system. FLAC can be built on Windows, Linux, Mac
+OS X using CMake.
+
+You can use either CMake's CLI or GUI. We recommend you to have a separate build
+folder outside the repository in order to not spoil it with generated files.
+
+CLI
+---
+   Go to your build folder and run something like this:
+
+   /path/to/flac/build$ cmake /path/to/flac/source
+
+   or e.g. in Windows shell
+
+   C:\path\to\flac\build> cmake \path\to\flac\source
+   (provided that cmake is in your %PATH% variable)
+
+   That will generate build scripts for the default build system (e.g. Makefiles
+   for UNIX). After that you start build with a command like this:
+
+   /path/to/flac/build$ make
+
+   And afterwards you can run tests or install the built libraries and headers
+
+   /path/to/flac/build$ make test
+   /path/to/flac/build$ make install
+
+   If you want use a build system other than default add -G flag to cmake, e.g.:
+
+   /path/to/flac/build$ cmake /path/to/flac/source -GNinja
+   /path/to/flac/build$ ninja
+
+   or:
+
+   /path/to/flac/build$ cmake /path/to/flac/source -GXcode
+
+   Use cmake --help to see the list of available generators.
+
+   If you have OGG on your system you can tell CMake to use it:
+
+   /path/to/flac/build$ cmake /path/to/flac/source -DWITH_OGG=ON
+
+   If CMake fails to find it you can help CMake by specifying the exact path:
+
+   /path/to/flac/build$ cmake /path/to/flac/source -DWITH_OGG=ON -DOGG_ROOT=/path/to/ogg
+
+   CMake will search for OGG by default so if you don't have it you can tell
+   cmake to not do so:
+
+   /path/to/flac/build$ cmake /path/to/flac/source -DWITH_OGG=OFF
+
+   Other FLAC's options (e.g. building C++ lib or docs) can also be put to cmake
+   through -D flag.
+
+GUI
+---
+   It is likely that you would prefer to use it on Windows building for Visual
+   Studio.  It's in essence the same process as building using CLI.
+
+   Open cmake-gui. In the window select a source directory (the repository's
+   root), a build directory (some other directory outside the repository). Then
+   press button "Configure". CMake will ask you which build system you prefer.
+   Choose that version of Visual Studio which you have on your system, choose
+   whether you want to build for x86 or amd64. Press OK. After CMake finishes
+   press "Generate" button, and after that "Open Project". In response CMake
+   will launch Visual Studio and open the generated solution. You can use it as
+   usual but remember that it was generated by CMake. That means that your
+   changes (e.g. some addidional compile flags) will be lost when you run CMake
+   next time.
+
+   Again, if you have OGG on your system set WITH_OGG flag in the list of
+   variables in cmake-gui window before you press "Configure".
+
+   If CMake fails to find MSVC compiler then running cmake-gui from MS Developer
+   comand prompt should help.